Seagate ST32112A, ST38421A Seek Mode, Read/Write power and current, Operating power and current

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U4 Family Product Manual, Rev. D

Seek Mode

During seek mode, the read/write actuator arm moves toward a specific position on the disc surface and does not execute a read or write operation. Servo electronics are active. Seek mode power rep- resents the worst-case power consumption, using only random seeks with read or write latency time. This mode is not typical and is provided for worst-case information.

Read/Write power and current

Read/write power is measured with the heads on track, based on a 16-sector write followed by a 32-msec delay, then a 16-sector read followed by a 32-msec delay.

Operating power and current

Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each 10 reads) and 20 percent drive inactive.

Idle mode power

Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in a random track location.

Standby mode

During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/write electronics are in power- down mode.

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Contents Product Manual Page Product Manual Page Contents Configuring and mounting the drive ATA interfaceFigures Seagate Connfidential Review Draft not for DistributionSeagate Confidential Review Draft not for Distribution Introduction Specification summary table Track-to-track seek time Msec typical Vibration, nonoperating Default logical geometry LBA ModeFormatted capacity Physical organizationPhysical characteristics Drive Specification ST38421A, ST36421A ST34311A, ST32112ARecording and interface technology Seek timePower specifications Power consumptionSpinup power Start/stop timesSeek Mode Read/Write power and currentOperating power and current Idle mode powerTypical current profile Power Mode Typical Watts Typical Amps RMS 12VCurrent amps Time seconds Conducted noise Power-management modesVoltage tolerance Environmental tolerances Ambient temperature Temperature gradientHumidity Relative HumidityWet bulb temperature AltitudeShock Operating shockNonoperating vibration Operating vibrationDrive acoustics Agency certification Safety certification Electromagnetic susceptibilityReliability Electromagnetic compatibilityFCC verification Australian C-TickU4 Family Product Manual, Rev. D Configuring and mounting the drive Handling and static-discharge precautionsJumper settings Master/slave configuration Master/slave jumper settingsImportant mounting precautions Cable-select optionUltra ATA/66 cable Drive mountingMounting dimensions-top, side and end view ATA interface signals and connector pins ATA interfaceO pins and supported ATA signals ATA Interface commands Supported ATA commands Command name Command code in hex ATA-standard commandsIdentify Drive command Command nameATA-standard power-management commands ATA-standard security commandsWord Description 27-46 Drive model number 40 Ascii char Multiword DMA active and modes Description if bit is set to Bit Word Set Features command 0CH4 S.M.A.R.T. commands Code in Features Register A.R.T. CommandPage U4 Family Product Manual, Rev. D U4 Family Product Manual, Rev. D
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